Knife



Nov. l, 1938. w..r. HARWELL KNIFE I Filed Jan. 29, 193s WIL BUR F: H new/:LL

Patented Nov. 1, 1938 UNITED STATES PATENT oFFlcE Y Claims.

This invention relates to a knife and more especially to one having a detachable blade therein which resembles the typeV used in an ordinary safety razor. These blades are adaptable for 5 shaving purposes for a limited length of time only, and after which the blades are usually discarded as useless, resulting in waste and destruction of material that might be used `to an advantage. My invention is particularly adaptable for use in combination with a safety razor blade commercially known as Gem razor blade. When a suitable handle is provided for mounting this blade the assembly may be used to an advantage in cutting paste board or other soft materials from which cartons are made.

` It is, therefore, an object of this invention toprovide a handle in combination with a safety razor blade with means associated with the handle for detachably securing the blade thereto.

It is a further object of this invention to provide a combination of a handle and a safety razor blade with means for pivotally and detachably securing one end of the razor blade to the handle, leaving the outermost or free end of the Vblade exposed so that it may penetrate the material which is being severed.

It 'is a still further object of this invention to provide a knife comprising a handle and a safety razor blade pivoted thereto with a cuff encircling the pivoted end of the razor blade, said cuff-acting as a guiding means to limit the depth that the blade is allowed to penetrate the article which is being severed.

Some of the objects of the invention having vbeen stated other objects will appear as the description proceeds, When taken in connection with the accompanying drawing, in which- Figure l is an isometric View of my invention;

Figure 2 'is an enlarged end vieW looking at the right-hand end of Figure 1;

Figure 3 is an isometric view similar to Figure 1 but showing the blade in an open position and ready for use;

Figure 4 is an enlarged sectional View taken along the line 4 4 in Figure 3;

Figure 5 is a longitudinal sectional View taken along the line 5--5 in FigureV 3, but showing the position occupied by the blade just prior to its removal or attachment to the handle;

,Figure 6 is an exploded isometric View of the assembly.

Referring more specically to the drawing, the numeral ID denotes a suitable handle which is preferably made of sheet meta-1 and welded together with the proper exterior contour. This CII thumb of the user is inserted when it is desired Y to open the knife.

The right-hand end of the handle Iil (Figure 6) has suitable transversely disposed holes I6 there-` in which are penetrated by a rivet I l. This rivet is also adapted to penetrate transversely disposed holes I8 of U-shaped cuff member i9 and transversely disposed holes 2D of U-shapedV locking member 2l. The cuff member I9 nts within the slot I2 with the holes I8 coinciding with the holes VIt `and aV suitable razor blade 22, suchV as that used in an ordinary Gem razor, is inserted in the U-shaped cuff member I9 in such a position that the slot 23 in the end of the blade will coincide with the. holes I8. Also the short U- shaped locking member 2| is inserted over the cutting edge of the blade with the transversely disposed holes 2U coinciding with the holes I6 and I8 and the notch 23.

It should be noted that the U-shaped member 2l has prongs 2id and 2lb and when this member is insertedy to its proper position over the blade 22, these prongs Will be disposed on the opposed sides of the blade. The prong Zia has integral With its end a projection 2Ic extending substantially at right angles to the portion vZia. This projection is adapted to rit into a slot 24 of the razor b-lade 22. When in this position, it is seen that the U-shaped locking portion ZI shields the cutting edge of the blade 22 in the vicinityadjacent the handle, but leaves the outer portion of the blade exposed. At the same time the U-shaped cuff I9 presses against both the prongs Zia and 2Ib and the pivoted end of the blade 22, and this member I9 is adapted to clamp over the back edge of the blade 22 sothat When the blade is opened or closed the member will carry the blade with it.

The right-hand end of the U-shaped cuff member I9 has shoulder portions ISa and Ib, one on each side of the blade. These shoulder portions act as a guide and also limit the depth to which Vthe blade may be inserted into a piece of material which is being cut.

t is alsoY seen that the handle l0 has a cutaway portion in its right-hand portion so as to form a suitable abutment shoulder Iiia against which surfaces ISC of the cuff I9 rests When the blade is in an open position. ln other words, when the surface I9c contacts the surface lila,

the blade cannot be further rotated and any force thereafter applied against the cutting edge of the blade will be transmitted to the handle.

When the blade is in a closed position as shown in Figure l, the shield 2! protects the sharp corner of the blade 22 which extends outside of the slot I2 and prevents this blade from cutting or injuring the user of the knife when in this position.

Also when the blade is in a closed position the portion Ib of the knife is contacted by the free end of the blade 22 thereby preventing the sharp edge of the blade from engaging the bottom portion of the cavity I2.

If it is desired to attach or remove a blade, the 1 Vciatedprojection Zic may be moved laterally so that the projection 2 Ic will be removed from slot 24. Since the notch 23 merely ts over the rivet I1, it is seen that the blade may be easily removed and another bladeinserted in position.

If desired, the blade may be reversed and the other end used, since a notch 23 is provided in each end of the blade. After a new blade is inserted, then, of course, Vit is necessary to return the bladeto' the position shown in Figure 3, at which time the U-shaped member' I9 will clamp the opposed sides of the blade. This clamping action is elected by the convergingends I9d and -I 9e of the locking member I9.

It is, therefore, seen that I :have provided a safetyfblade knife which has means for pivotally and detachably securing a razor blade thereto in such a manner that one end of the blade will be entirely exposed and capable of use, and which can be shielded when not in use.

In the drawing and specification there has been set forth a preferred embodimentof the invention, and although specific terms are employed, they are used in a generic and descriptivesenseonly, and not for purposes of limitation, the scope of the invention being set forth in the appended claims.

I claim:

1 'A device comprising a handle Vmember,` a blade holding member having one end disposed within the handle member and pivotally connected thereto, a blade locking memberhaving one end pivotally mounted within the handle on the same pivot as the blade holding member, said blade having a hole intermediate its ends, said blade locking member having outwardly extending prongs disposed on each side of the blade, and one of the prongs having a projectionadapted to't into said hole so that when the outer ends of the blade locking member are positioned within the blade holding member, the blade will be locked in position within the blade holding member.

2. A device comprising a handle .memben a blade holding member having one end disposed within the handle member and pivotally connected thereto, a blade locking member having one end pivotally mounted within the handle on the same pivot as the blade holding member, said blade having a hole intermediate its ends, said blade locking member having outwardly extending prongs disposed on each side of the blade, and one of the prongs having a projection adapted to t into said hole so that when the outer ends of the blade locking member are positioned within the blade holding member, the blade will be locked in posi-tion within. the blade holdingv member, the blade locking member having a portion shielding the cutting edge of the blade disposed next to the 1. handlemember.

3. A device comprising a handle member, a

zblade holding member having one end disposed within the handle member and pivotally connected thereto, a blade locking member having one-fend pivotal-ly mounted within the handle on the Asame pivot as the blade holding member, said bladeV having a hole intermediate its ends, said blade locking member `having outwardly extending prongs disposed on eachside of the blade, and one of the prongs having. azprojection adapted to fitinto said hole so that when the outer ends of the blade locking member are positioned'withinthe blade holding member,` the blade willfbe locked in position within the blade holding member, the blade holding member being of less overall length tha-n the blade to :limit the depth of cut ofthe blade.

. 4. A device comprising `a handle member, a blade holding member having oneV end disposed within' the handle member and .pivotally connected thereto, a blade locking memberr having' one end pivotally mounted within the handle on the same pivot as the blade holding member, said blade having a hole intermediate its ends, said blade locking member having outwardly extending prongs disposed on each side of the blade, and one of the prongs having a projection adapted to it into -said hole so that when the outer ends of the blade locking `member are positioned within the blade holding member, the blade will be locked in position Within the blade holding member, the blade locking memberhaving a portion shielding the cutting edge of the blade disposed. next to the handle. member, and the blade holding member being of less overall length than the blade to limit the depth of out of the blade.

5. A safety razor blade knife comprising a handle member having a cavity therein open on one side and one end, a razor blade having a cutting edge and a rib on' its opposite edge, -a

- blade holding member, U-shaped in cross-section and having one :end pivotally mounted in 'the open end of said kcavity and having its other end constricted near .its outer edges and being of substantially less length than the blade, said blade having a notch in 'each end and having a hole intermediate its ends, a blade locking member pivoted on the same pivot as 'the blade holding member and having a portion shielding the cutting edge of the base of the blade and having prongs, atleast one of which is provided with an extension for fitting `into 'said hole in said blade for holding the blade in position when the blade locking member is disposed inside the blade holding member. Y

WILBUR F. HARWELL. 

